SW2: Terminal interface
Interface with HSD terminal.
OFF:
ON:
SW3: Automatic data rate switching
Determines whether to receive data at data rate other than what is set with the Data Rate switch in the switch panel.
OFF: Prevents reception of data received at data rate other than which is set with the data rate switch.
ON: Enables reception of data received at data rate other than which is set with the data rate switch.
SW4: Command format
Sets command format to the HSD modem, and is only effective when SW1 is set for address call (ON). Set according to specification of HSD terminal.
OFF: HDLC format
ON: BSC format
HDLC command format
Flag
Addr
Control
Command/Indication
FCS
Flag
Flag: Flag | b0 b1 · · · · · | b7 | |
|
|
| |
Address: Address Field | 0 | 1 1 1 1 1 1 | 0 |
|
|
| |
Control: Control Field | 1 | 1 1 1 1 1 1 | 1 |
|
|
| |
FCS: Frame Check Sequence | 1 | 1 0 0 1 0 0 | 0 |
|
|
| |
Parity added only to command, indication. (b0) sent first along signal wire.
BSC command format
SYN
SYN
SYN
STX
Command, Indication
ETX
SYN: 16H | Three SYN sent from HSD terminal to |
STX: 02H | HSD modem. However, only two SYN are |
ETX: 03H | necessary between the HSD modem and |
| the HSD terminal. |
Parity is also added to these control characters. LSB is first sent along the signal line.
SW5: Character format
Sets character format to the HSD modem, and is only effective when SW1 is set for ad- dress call (ON). Set according to specification of HSD terminal.
OFF: 8 bit, no parity
ON: 7 bit, even, odd parity
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